Area Code 240 – Luxembourg

Geographic Allocation and Coverage

The +352 240 prefix is a geographic area code assigned to the Grand Duchy of Luxembourg. Specifically, it serves the capital city, Luxembourg City, and its immediate surrounding areas. As a geographic number, the prefix is tied to a fixed line location, although in modern telecommunications, VoIP and fixed wireless services may also use this range. The administrative jurisdiction falls under the Luxembourg Institute of Regulation (ILR), which oversees national numbering resources.

Dialing Formats

For callers within Luxembourg, the national format requires dialing the full number including the leading '0'? Actually, Luxembourg uses a closed dialing plan. The national significant number (NSN) is 9 digits, and the area code is 3 digits (240). To call a local number, you dial the area code followed by the subscriber number, e.g., 240 123 456. There is no trunk prefix '0' in Luxembourg; you simply dial the 9-digit number. For international callers, you dial the country code +352, then the area code without any leading zero, followed by the subscriber number: +352 240 123 456.

Primary Cities and Local Services

This prefix is predominantly used in Luxembourg City, the country's capital and largest urban center. It serves government institutions, corporate headquarters, financial services, and residential customers. The area is home to key districts such as Kirchberg, where many EU institutions are located, and the central business district. Because of the city's role as a global financial hub, numbers with this prefix are often associated with banks, law firms, and international organizations.

Overlay and Numbering Considerations

Luxembourg does not currently have overlay codes for geographic numbers. The numbering plan is well-structured, and the ILR ensures sufficient capacity. However, with the growth of VoIP and the migration from traditional PSTN, some geographic numbers may be used for non-geographic services, but the prefix remains officially designated for geographic use. Callers should note that while the prefix indicates a geographic location, the actual physical location of the called party may vary due to number portability. This is particularly relevant for businesses that have moved but retained their numbers.

Caller Instructions

For local callers within Luxembourg, simply dial the 9-digit number (e.g., 240 123 456). For international callers, replace the leading '0' if present with the country code +352. For example, a UK caller would dial 00 352 240 123 456. Always verify the number length: Luxembourg numbers are 9 digits after the country code, and the area code is included in that count.